This computer is not yet managed. It is protected but has not yet reported back its status

Hi all,

I'm trialing Sophos at work, but i've received errors when installing on the servers. 

It looks like the client has actually installed on the machines, but from the Control Center the errors ocurr.

Can anybody extend their knowledge and support on this error?

Below is the entire error log:

                                           Computer name                           XXX_Marketing   Computer description                       Operating system                        Windows Server 2008 R2   Service pack                               Domain/workgroup                           IP address                                 Sophos Anti-Virus version                  HIPS rules                                 HIPS configuration                         Detection data                             On-access scanning                         Anti-virus and HIPS configuration          Last scheduled scan completed              Last message received from computer        Up to date                                 Updating configuration                     Time installed package became available    Time next package became available      01/06/2011 16:52:59   Primary update server                      Secondary update server                    Client firewall enabled                    Sophos Client Firewall configuration       Sophos Client Firewall version             Client firewall mode                       Application control configuration          Application control on-access scanning     Device control scanning status             Device control configuration            
   Installation failed.                                                                 Date/time                Code      Description                                                                          30/05/2011 19:07:20      fffffffd  This computer is not yet managed. It is protected but has not yet reported back its status.

Thanks,

Christian